[Bug 286176] x11-toolkits/rubygem-gtk2: Fix build with rubygem-glib2-4.2.7

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286176

            Bug ID: 286176
           Summary: x11-toolkits/rubygem-gtk2: Fix build with
                    rubygem-glib2-4.2.7
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet@FreeBSD.org
          Reporter: dinoex@FreeBSD.org
          Assignee: sunpoet@FreeBSD.org
             Flags: maintainer-feedback?(sunpoet@FreeBSD.org)

Created attachment 259667
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=259667&action=edit
suggested patch

ports fails to build:

```
rbgtkcontainer.c:510:12: warning: call to undeclared function
'rbgobj_gobject_new'; ISO C99 and later do not support implicit function
declarations [-Wimplicit-function-declaration]
  510 |     gobj = rbgobj_gobject_new(RVAL2GTYPE(self), params_hash);
      |            ^
```

See report:
https://lists.freebsd.org/archives/freebsd-pkg-fallout/2025-February/729794.html

The attached patch fixed the build for me.

Obtained from: Fedora
git clone https://src.fedoraproject.org/rpms/rubygem-gtk2.git
file: rubygem-gtk2/gtk2-3.4.3-c23-port-to-glib2_426.patch

Tested with a small ruby application, GUI comes up.

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